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Cotton Response to Pre-plant Irrigation Level and Irrigation Capacity Using Spray, LEPA, and Subsurface Drip Irrigation

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032008,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13753) @2003
Authors:   James P. Bordovsky, Dana Porter
Keywords:   Irrigation, LEPA, Subsurface drip irrigation, SDI, Pre-plant irrigation, cotton, Water use efficiency

Wind incidence can affect microsprinkler water distribution. Evaluations in those conditions can be facilitated using simulations by computational models. The present work evaluates the performance of a ballistic model on simulating the wind effect on microsprinkler water distribution. Experimental tests were carried out using self-compensating microsprinklers, nozzle sizes 1.00 mm (gray), 1.10 mm (brown), 1.48 mm (orange), and 1.75 mm (yellow). The gray and brown nozzles used black swivels and the orange and yellow nozzles used blue swivels. The wind effect was artificially caused by fourteen 200 W fans. The computational simulations were realized using SIRIAS software, which is based on a ballistic model originally developed for sprinkler systems. The correlation coefficients (r) varied between 0.619 and 0.880, while the exactness coefficients (d) varied between 0.842 and 0.944. Swivels internal geometry influenced the results. The tested model presented a performance classified as very good for the black swivel nozzles and a regular performance for the blue swivels nozzles.

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